The adhesion properties of diamond coatings on cemented-carbide tools have been improved by two approaches: a novel substrate pre-treatment method and a three-step process for making metal-reinforced diamond composites. 1. (1) Diamond powders are rubbed into the voids created by cobalt removal from the cemented carbides. During subsequent diamond deposition these diamond powders consolidate to form the "anchoring roots" of the deposited diamond films, resulting in strong mechanical bonding between the films and substrates. 2. (2) The adhesion can also be improved by adding reinforcing phases using a three-step process. The above two methods have effectively overcome the film delamination problems due to the considerable thermal stress associated with curvature effects.
|Original language||English (US)|
|Number of pages||4|
|Journal||Diamond and Related Materials|
|State||Published - Apr 13 1993|
|Event||Proceedings of the 3rd International Conference on the New Diamond Science and Technology (ICNDST-3) jointly with 3rd European Conference on Diamond, Diamond-like and Related Coatings (DF '92). Part 2 (of 2) - Heidelberg, Ger|
Duration: Aug 31 1992 → Sep 4 1992
Bibliographical noteFunding Information:
This work has been supported by the National Science Foundation under Grant NSF/ECD-8721545, ERC for Plasma-aided Manufacturing. The US government has certain rights in this material.